Seasonal variability of ozone dry deposition under southern European climate conditions, in Portugal. Pio, C., A., Feliciano, M., S., Vermeulen, A., T., & Sousa, E., C. Atmospheric Environment, 34(2):195-205, 1, 2000.
Seasonal variability of ozone dry deposition under southern European climate conditions, in Portugal [pdf]Paper  Seasonal variability of ozone dry deposition under southern European climate conditions, in Portugal [link]Website  abstract   bibtex   
Ozone dry deposition measurements were carried out during approximately one year over a #at grass "eld in Portugal. The results show prominent diurnal and seasonal patterns in deposition #ux, dry deposition velocity and surface resistance, especially for the daytime period. Dry deposition velocities vary diurnally from a minimum of 0.1 cm s? , during the night to a maximum of 0.20.5 cm s? during the day. The observed canopy resistance (R?) varies from values higher than 500 sm? , at night, to a minimum of 200 s m? , around noon. Seasonal variation is characterised by daytime R? values much larger in summer than in winter and spring, while nighttime values do not show any evident seasonal pattern. This behaviour can be ascribed to the stomatal intake, which represents the most important controlling factor on ozone dry deposition. The Wesely parameterisation scheme of surface resistance predicts R? diurnal cycles reasonably well. However, the observed canopy resistance seasonal cycle is completely di!erent from Wesely predictions, since season parameters in Wesely's parameterisation were de"ned for a vegetation growing cycle di!erent from that prevailing in our conditions. ? 1999 Elsevier Science Ltd. All rights reserved

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